Updating rather than replacing ECS Task Definition with CloudFormation

Question 1

When updating a TaskDefinition in CloudFormation the docs say that a replacement action occurs –
http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-ecs-taskdefinition.html

Is there a way to get that to be a new revision? Should I be using the family parameter? Is there a TaskDefinition limit? Otherwise I end up with a large number of inactive definitions.

ContainerDefinitions:
  - Name: container
    Essential: 'true'
    Image: image:tag
    PortMappings:
      - ContainerPort: 80
        HostPort: 80
        Protocol: 'tcp'
    TaskRoleArn: 'arn:aws:iam::role'

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ContainerDefinitions:

- Name: container

Essential: 'true'

Image: image:tag

PortMappings:

- ContainerPort: 80

HostPort: 80

Protocol: 'tcp'

TaskRoleArn: 'arn:aws:iam::role'

Question 2

Yes, in order to put your changes in a new revision of the same Task Definition you should use the Family parameter. Quoting from the official documentation:

Family

The name of a family that this task definition is registered to. A
family groups multiple versions of a task definition.

CloudFormation will still consider this a “replacement” and will delete the old revision, however it will not create a new Task Definition if you use the Family parameter.

Updating rather than replacing ECS Task Definition with CloudFormation

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